I live in Canada, i tried to buy a iRobot 960 [$849 + 13% HST = $959.37 CA on Amazon] and ship it to my sister, she is building a house, and getting married...i love my Roomba and thought it'd be a fun present. Sadly I cannot do this, and since Amazon is just a book store in Australia there is really no option for using Amazon here.
The 'competition', Harvey Norman, lists the same item at $1399 AU. For fun, the exchange rate is $1.01 AUD for $1 CAD, pretty damn close. Import taxes I assumed, but then I found a cheaper and lesser known electronics website in Australia sells it for $1049 [taxes included]. Pretty close!
The moral to this story: Amazon will continue to be successful and grow as long as traditional retail insists on ripping off it's customers. I look forward to them prioritizing growth over profits for years to come, the entire world remains!